[libc-commits] [libc] Reland "[libc] fix aarch64 linux full build (#95358)" (PR #95423)

[Schrodinger ZHU Yifan via libc-commits]

https://github.com/SchrodingerZhu created https://github.com/llvm/llvm-project/pull/95423

Reverts llvm/llvm-project#95419 and Reland #95358 



>From 91323a6ea8f32a9fe2cec7051e8a99b87157133e Mon Sep 17 00:00:00 2001
From: Schrodinger ZHU Yifan <yifzhu at nvidia.com>
Date: Thu, 13 Jun 2024 08:38:05 -0700
Subject: [PATCH] Revert "Revert "[libc] fix aarch64 linux full build (#95358)"
 (#95419)"

This reverts commit 9e5428e6b02c77fb18c4bdf688a216c957fd7a53.
---
 libc/config/linux/aarch64/entrypoints.txt       | 7 +++++++
 libc/src/__support/threads/linux/CMakeLists.txt | 1 +
 libc/test/IntegrationTest/test.cpp              | 6 ++++++
 3 files changed, 14 insertions(+)

diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index db96a80051a8d..7ce088689b925 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -643,6 +643,12 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.pthread.pthread_mutexattr_setrobust
     libc.src.pthread.pthread_mutexattr_settype
     libc.src.pthread.pthread_once
+    libc.src.pthread.pthread_rwlockattr_destroy
+    libc.src.pthread.pthread_rwlockattr_getkind_np
+    libc.src.pthread.pthread_rwlockattr_getpshared
+    libc.src.pthread.pthread_rwlockattr_init
+    libc.src.pthread.pthread_rwlockattr_setkind_np
+    libc.src.pthread.pthread_rwlockattr_setpshared
     libc.src.pthread.pthread_setspecific
 
     # sched.h entrypoints
@@ -753,6 +759,7 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.unistd._exit
     libc.src.unistd.environ
     libc.src.unistd.execv
+    libc.src.unistd.fork
     libc.src.unistd.getopt
     libc.src.unistd.optarg
     libc.src.unistd.optind
diff --git a/libc/src/__support/threads/linux/CMakeLists.txt b/libc/src/__support/threads/linux/CMakeLists.txt
index 9bf88ccc84557..8e6cd7227b2c8 100644
--- a/libc/src/__support/threads/linux/CMakeLists.txt
+++ b/libc/src/__support/threads/linux/CMakeLists.txt
@@ -64,6 +64,7 @@ add_object_library(
     .futex_utils
     libc.config.linux.app_h
     libc.include.sys_syscall
+    libc.include.fcntl
     libc.src.errno.errno
     libc.src.__support.CPP.atomic
     libc.src.__support.CPP.stringstream
diff --git a/libc/test/IntegrationTest/test.cpp b/libc/test/IntegrationTest/test.cpp
index 3bdbe89a3fb62..27e7f29efa0f1 100644
--- a/libc/test/IntegrationTest/test.cpp
+++ b/libc/test/IntegrationTest/test.cpp
@@ -79,4 +79,10 @@ void *realloc(void *ptr, size_t s) {
 // Integration tests are linked with -nostdlib. BFD linker expects
 // __dso_handle when -nostdlib is used.
 void *__dso_handle = nullptr;
+
+// On some platform (aarch64 fedora tested) full build integration test
+// objects need to link against libgcc, which may expect a __getauxval
+// function. For now, it is fine to provide a weak definition that always
+// returns false.
+[[gnu::weak]] bool __getauxval(uint64_t, uint64_t *) { return false; }
 } // extern "C"